AutoCodes – GMC – P101C 2015 GMC Sierra

P101C 2015 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

Quick Answer

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P101C 2015 GMC Sierra indicates Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage.
Common causes: Common causes include Faulty Glow Plug Control Module (GPCM), Glow Plug Control Module harness is open or shorted, Glow Plug Control Module circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 219

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P101C 2015 GMC Sierra Description

The Glow Plug Control Module (GPCM) has the ability to perform internal diagnostics for the temperature sensor circuit. The GPCM monitors the internal temperature sensor voltage and if the voltage is less than 0.21 V or greater than 4.94 V. The GPCM will send a message to the Engine Control Module (ECM) to set the appropriate Diagnostic Trouble Code (DTC). A DTC is detected when one of the GPCM temperature sensors voltage falls outside the calibrated threshold for greater than 1.3 s.

OBDII Code P101C 2015 GMC Sierra - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage - AutoCodes.com — P101C 2015 GMC Sierra Code - Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P101C 2015 GMC Sierra?

Faulty Glow Plug Control Module (GPCM)
Glow Plug Control Module harness is open or shorted
Glow Plug Control Module circuit poor electrical connection

How to Fix the DTC P101C 2015 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P101C 2015 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P101C 2015 GMC Sierra code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P101C 2015 GMC Sierra Code

1. What does the OBDII code P101C mean on a 2015 GMC Sierra?

P101C indicates a "Glow Plug Control Module Temperature Sensor 2 Circuit High Voltage" issue, meaning the sensor is reporting a voltage higher than expected.

2. What are the common symptoms of a P101C code in a 2015 GMC Sierra?

Symptoms may include an illuminated Check Engine Light, difficulty starting in cold weather, reduced engine performance, or irregular glow plug operation.

3. What causes the P101C code to appear on a 2015 GMC Sierra?

Possible causes include a faulty temperature sensor 2, damaged or corroded wiring, poor electrical connections, or a malfunctioning Glow Plug Control Module.

4. Can I drive my 2015 GMC Sierra with a P101C code?

While the vehicle may still be drivable, it's not recommended as the issue can affect cold starts and engine performance, potentially leading to further damage.

5. How do I diagnose a P101C code on a 2015 GMC Sierra?

Start by inspecting the temperature sensor 2, its wiring, and connectors for damage or corrosion. Use a multimeter to check voltage readings and ensure they are within the specified range.

6. How can the P101C code be fixed on a 2015 GMC Sierra?

Repairs may involve replacing the Glow Plug Control Module temperature sensor 2, repairing damaged wiring, cleaning corroded connections, or replacing the module itself.

7. What tools are needed to resolve a P101C code on a 2015 GMC Sierra?

You may need an OBDII scanner, a multimeter, basic hand tools, and possibly a wiring diagram for the Glow Plug Control Module circuit.

8. How much does it cost to fix a P101C code on a 2015 GMC Sierra?

Repair costs vary but can range from $100 to $500 depending on whether the issue is with the sensor, wiring, or the Glow Plug Control Module.

9. Can a bad Glow Plug Control Module cause a P101C code?

Yes, if the module is malfunctioning, it may send incorrect voltage signals, triggering the P101C code.

10. How can I prevent the P101C code from recurring on my 2015 GMC Sierra?

Regularly inspect and maintain the Glow Plug Control Module system, including sensors, wiring, and connectors, to ensure they remain in good condition.